Add GrCap for initializing textures

Change-Id: Ifdf50c6686a3369a00cc15fa868a4807f0898fd6
Bug: skia:8378
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/204266
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
3 files changed